Merge commit 'origin/vendor/PAM_PASSWDQC'
[games.git] / games / cribbage / cards.c
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1/*-
2 * Copyright (c) 1980, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
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32 *
33 * @(#)cards.c 8.1 (Berkeley) 5/31/93
34 * $FreeBSD: src/games/cribbage/cards.c,v 1.5 1999/11/30 03:48:44 billf Exp $
413c6806 35 * $DragonFly: src/games/cribbage/cards.c,v 1.3 2005/08/03 13:31:00 eirikn Exp $
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36 */
37
984263bc 38#include <stdlib.h>
984263bc 39
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40#include "cribbage.h"
41
413c6806 42static bool eq(CARD, CARD);
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43/*
44 * Initialize a deck of cards to contain one of each type.
45 */
46void
413c6806 47makedeck(CARD d[])
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48{
49 int i, j, k;
50
51 srandomdev();
52 k = 0;
53 for (i = 0; i < RANKS; i++)
54 for (j = 0; j < SUITS; j++) {
55 d[k].suit = j;
56 d[k++].rank = i;
57 }
58}
59
60/*
61 * Given a deck of cards, shuffle it -- i.e. randomize it
62 * see Knuth, vol. 2, page 125.
63 */
64void
413c6806 65shuffle(CARD d[])
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66{
67 int j, k;
68 CARD c;
69
70 for (j = CARDS; j > 0; --j) {
71 k = random() % j; /* random 0 <= k < j */
72 c = d[j - 1]; /* exchange (j - 1) and k */
73 d[j - 1] = d[k];
74 d[k] = c;
75 }
76}
77
78/*
79 * return true if the two cards are equal...
80 */
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81static bool
82eq(CARD a, CARD b)
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83{
84 return ((a.rank == b.rank) && (a.suit == b.suit));
85}
86
87/*
88 * isone returns TRUE if a is in the set of cards b
89 */
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90bool
91isone(CARD a, CARD b[], int n)
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92{
93 int i;
94
95 for (i = 0; i < n; i++)
96 if (eq(a, b[i]))
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97 return (true);
98 return (false);
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99}
100
101/*
102 * remove the card a from the deck d of n cards
103 */
104void
413c6806 105cremove(CARD a, CARD d[], int n)
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106{
107 int i, j;
108
109 for (i = j = 0; i < n; i++)
110 if (!eq(a, d[i]))
111 d[j++] = d[i];
112 if (j < n)
113 d[j].suit = d[j].rank = EMPTY;
114}
115
116/*
117 * sorthand:
118 * Sort a hand of n cards
119 */
120void
413c6806 121sorthand(CARD h[], int n)
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122{
123 CARD *cp, *endp;
124 CARD c;
125
126 for (endp = &h[n]; h < endp - 1; h++)
127 for (cp = h + 1; cp < endp; cp++)
128 if ((cp->rank < h->rank) ||
129 (cp->rank == h->rank && cp->suit < h->suit)) {
130 c = *h;
131 *h = *cp;
132 *cp = c;
133 }
134}